This is possibly the best recruiting experience I have ever encountered. The feedback and notification of whether I passed to the next round took literally a day, or even the same day! The recruiter was so resourceful and genuinely cared. I would receive calls to check on my preparation progress, and for each round, she would guide me on what to focus on.

As far as the interview itself goes:

• Know your data structures, not just what they are, but how and when to use them for a given problem. I needed to use them twice in different interviews here.
• Additionally, I'm not sure if this is specific to PE roles, but you basically need to know some sort of scripting, preferably both shell and another language like Python, PHP, or Perl. I don't think some of the questions would be solved easily without them.
• Lastly, for the systems rounds (you will have two: one phone and one onsite), know your basic troubleshooting tools, Linux command line, and filesystem (for Unix/Linux-based systems). Understand what goes where, as this knowledge will help with troubleshooting.

Also, try to tackle questions like "what to do when something is wrong." ScoutApp's articles on tools were helpful for learning some troubleshooting techniques.

The recruiter recommended many resources for coding practice; my favorite was LeetCode. Careercup is also good. Additionally, check Glassdoor for more insights; it especially helped for the first phone screen.

Whatever the final outcome, you will learn a great deal from this experience. At the very least, you should feel well-prepared for other interviews after going through this process.

Happy interviewing!